a for the destruction they cause
b account for less than 1 %
c on average
d to be extinct
e 163 villages were wiped out f on the floor ofthe ocean
g a mountain throwing out ash
h more than 600
i to be active
The popular image of a volcano is of 1. _, steam, fire and molten rock from a crater in the top, often with explosive violence. Such volcanoes do indeed exist, but they 2. _ of the world’s volcanic activity. The bulk of the Earth’s volcanism occurs unseen 3._.
Volcanoes that have ceased to erupt are said 4._. Other volcanoes that have been quiet for a long time but that may erupt again are described as dormant, while those that have erupted in historic times are said 5._. Volcanoes are notorious 6._. When in 1669 Etna in Sicily, Italy, erupted 20,000 people were killed, and lava reached the city of Catania, 28 km from the summit. Another tragic example is the eruption of Krakatau in Indonesia in 1883 when 7. and 36,380 people were killed by the giant wave caused by this, the greatest volcanic eruption recorded.
There are 8. _ active volcanoes on Earth. Indonesia alone has about 160 and Iceland has about 200 active volcanoes. 9._, between 20-30 volcanoes erupt each year.